Wholesale Data Centre Colocation vs Retail and Build-to-Suit

Wholesale Capacity Models and Thresholds

Procuring data centre capacity involves choosing between retail colocation, wholesale leases, and build-to-suit developments based on power scale, operational control, and delivery schedules.

Wholesale capacity thresholds vary across operators. Operators commonly treat a megawatt or more as clearly wholesale (Data Center Scouts). Occupiers should ask providers whether private suites exist below this scale or whether dedicated halls apply.

CBRE Investment Management (undated) records typical wholesale lease terms of five to 20 years (CBRE Investment Management); any operator funding rationale or retail comparison should be tested in commercial diligence. Occupiers must verify renewal rights, early surrender terms, and reinstatement duties before signing.

Wholesale transactions follow two primary formats:

• Turnkey wholesale: The operator supplies fitted whitespace with operational plant. Occupiers supply their IT equipment and should confirm whether containment and structured cabling are included or billed separately.
• Powered shell: The landlord provides the building envelope and utility connection. The occupier funds and fits out internal plant and whitespace.

The phrase “powered land” is an industry marketing term, not a certification. A seller may use it to describe anything from an initial feasibility enquiry to an executed connection agreement. Buyers should focus on verified utility documentation and connection status.

Questions to ask landowners:

• Has the network operator issued a binding connection agreement or an informal enquiry response?
• What queue position and written energisation date has the utility confirmed?
• Have connection deposits been paid to preserve queue standing?
• Are off-site cable easements secured between the parcel and the substation?

Comparing Wholesale and Retail Colocation

Retail colocation provides space by the cabinet or caged row in shared whitespace, with communal plant, cooling, and security managed by the operator. Wholesale colocation provides dedicated suites or entire halls.

Buyers should compare wholesale and retail offers across four operational boundaries:

• Physical demarcation: Compare whether access is restricted to a dedicated slab-to-slab hall or sits within shared whitespace.
• Power billing: Compare whether electricity is billed as metered pass-through with an agreed PUE formula, a fixed reservation charge, or bundled into rack fees.
• Environmental control: Compare whether temperature and humidity set-points are individually adjustable or tied to shared facility bands.
• Telecommunications: Compare whether tenants can secure private duct entries and dedicated pathways or must use shared meet-me rooms.

Questions to ask colocation providers:

• Is the hall partitioned slab-to-slab without shared air plenums?
• How is electrical energy metered, and what formula governs the PUE calculation?
• What management mark-ups apply to utility rates?
• What exact temperature and humidity set-points are specified at the rack intake?
• Are carrier cross-connect fees billed as one-off installations or recurring monthly charges?
• Can the occupier deploy direct liquid cooling or non-standard containment?

Build-to-Suit Evaluation

Build-to-suit developments apply when multi-tenant halls cannot satisfy technical specifications, power scale, or location requirements. The occupier contracts with a developer to construct a dedicated facility.

Organisations evaluate build-to-suit options when:

• Scale requirements: Power needs exceed contiguous space in operational campuses, requiring dedicated sub-stations.
• Bespoke engineering: Non-standard floor loading, higher ceilings, or specialised cooling topologies cannot be retrofitted into existing halls.
• Strategic location: Sites require proximity to private generation, industrial facilities, or subsea landing stations.
• Asset control: Occupiers require long-term ground leases, purchase options, or freehold ownership.

Turnkey wholesale can be faster where suitable capacity and utility power exist on site. Greenfield projects require planning approvals, grid connections, civil construction, and integrated testing before IT fit-out.

Questions to ask developers:

• What planning permissions and environmental approvals are required before groundworks commence?
• Has the network operator issued a signed connection agreement with confirmed energisation dates?
• Who carries financial liability for grid delays or civil cost overruns?
• Does the contract permit early access for IT fit-out before formal practical completion?

Commercial Leases and Demarcation Boundaries

Wholesale leases allocate operational duties, maintenance expenses, and utility charges across different structures:

• Modified gross: The landlord maintains the building shell and primary plant, while the tenant pays base rent plus metered power.
• Triple net: The tenant pays base rent and manages or reimburses taxes, insurance, and plant maintenance directly.

Demarcation points define where landlord liability ends and tenant responsibility begins. Misaligned boundaries cause operational friction. Occupiers should verify boundaries directly on electrical single-line diagrams and mechanical schematics.

Questions to ask landlords:

• Which lease structure governs the facility, and which plant maintenance duties fall to the landlord versus the tenant?
• Where does electrical demarcation sit: at utility switchgear, transformer terminals, UPS outputs, or busway tap-offs?
• Where does mechanical demarcation sit: at central chilled water risers, CRAH valves, or rack-level distribution?
• Who maintains the cable pathways between external property boundaries, building entries, and the whitespace?
• What advance notice is required for scheduled maintenance on upstream switchgear and cooling plant?
• What service level credits apply if continuous power or environmental envelopes are breached?
• What baseline PUE is contracted, and what sub-metering records are provided?
• What make-good obligations apply upon lease expiry?

Technical Due Diligence Questions

Evaluating wholesale capacity requires engineering review across critical building systems, including utility redundancy, standby power, mechanical resilience, and floor loading.

Questions to ask engineering specialists:

• Are critical electrical and mechanical distribution paths concurrently maintainable without dropping resilience?
• How many hours of generator fuel are stored on site at full load, and what is the testing schedule?
• Does cooling continue uninterrupted during the transfer from grid to backup generators?
• What are the certified maximum static and dynamic floor loading limits across whitespace and delivery routes?
• What fire suppression and water-leak detection systems protect the whitespace?
• What historical flood, seismic, and adjacent industrial risks apply to the site?

Sourcing Wholesale Capacity and Preparing a Brief

Approaching data centre operators requires a structured capacity brief setting out functional requirements without exposing confidential network architecture:

• Target capacity: Megawatt power requirements, distinguishing initial deployment from expansion blocks.
• Power density: Average and peak power draw per cabinet, noting cooling preferences such as air cooling or direct liquid cooling.
• Redundancy requirements: Electrical resilience topologies, backup runtime expectations, and environmental operating envelopes.
• Target schedule: Milestone dates for site access, fit-out, circuit delivery, integrated testing, and commercial launch.
• Geographic scope: Preferred metropolitan areas, network latency limits to peering exchanges, and operational access requirements.

Data Centre Axis reviews stated requirements against its research, supplies individually scoped capacity briefs, and arranges managed private introductions where both parties agree to speak. Public directories cover the United Kingdom through /uk/data-centres/ and Australia via /au/data-centres/. Enquiries elsewhere are reviewed individually, not through a claimed global matching capability. Commercial terms stay strictly between the transacting parties.

Where an occupier or developer requires project-specific support, advisory services are scoped individually. Detailed technical, legal, or commercial specialist work requires a separate agreed scope. Operators and developers may submit asset or land details for review at /list-an-asset/?region=global&intent=asset-submission&source=colocation-wholesale; submission does not indicate availability, verification, or an introduction. Prospective occupiers can submit requirements at /get-verified/?region=global&intent=capacity-sourcing&source=colocation-wholesale. Related research covers data centre land, data centre investment, and general colocation.